SharePoint 2010 WebRequest for Version Header
http://www.sharepointboost.com/blog/different-ways-to-get-sharepoint-versions/
string GetSharePointVersion(string url, ICredentials credentials)... [read more]
{
string version = string.Empty;
try
{
Uri uri = new Uri(url);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
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